SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fafd6b3ab1b16d9e7e014562d98f81e67f08272a9a5028d849f528f73d910e7' 
  AND token = 'IGBO6EBJ7g/VWZg9n+Sc00wyvxUg3+U+JbiTLT74f6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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