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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a300e07c399c197b763d224ccc09dab7aff8b11145779647194ded6ffc0310' 
  AND token = '56YdtjIKOGX/67xzn5OxRpvUytMQ32Gik8onsOt0Opo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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