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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb840b81dec73be193742e2cfcfd0c947f7977453c7e81b2acc9fa98bf9229f' 
  AND token = 'y9Y9rYWEP8g/biGPG4Mab1cRewwvWflXA/HvhEY0H2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}