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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f2da10cd4063528acca7b47f826c8a8f0cd1590648e5d7f5f188014a322d7c' 
  AND token = '5O0EO7Cj7GIz0/C68SY5+A5cQ2YNBPR0wb1K8yVos9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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