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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bf35faf09ba3df24a327d0b465606eb3cc995735dad02af45fa0e3892e71c1' 
  AND token = 'LNPrT1q0n2sC1ch4yUKmi0AGQH7AygcLK0JjZpZK5aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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