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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b50b902a6aa3b34964eb9be400e6046ec26987e01ac3ff7f9fe35a9b31c21d9' 
  AND token = 'nCwTiU9J7uZldpkZogzqFsEgxdFo2nIvgSFaJvTrTZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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