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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc03e9ceeaf62c28762eeb852eb6afa603b509fac4f022256bd890f955e94b5' 
  AND token = 'J7lQdhF4iRYnoZZcbxuMtuHKzGehXb5a+PeJ0CgxBDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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