SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1978dbefae86f8a39b2042cf8f4d4f74871002e5f834e8ab446d3e32a15631' 
  AND token = '0nhsfvJSTkhiGJvgCQXc24zJz2l4K+mJPwswtt1/Kz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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