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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89490300f1845cfd196659a7888505cd6d0ec04b43598faf3edb73f0c1cf26bf' 
  AND token = 'Q7Dj51fq9hkxf5qum4gCJGhjEKT/FWorOi4p5IeFPCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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