SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20191f3b0b11603c0891f924ea61465bc93e6cc56b438f9753826ac711e82892' 
  AND token = 'LSA+sGdUfXS3aPtChJxZUPFvwqnmZBoBw/Yl9hjRyxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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