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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633fb2be397d842a66050aaa602942abaca1497c01feb2ff799ad3aeb7376a25' 
  AND token = 'k78j/0GUVr6Ym64Rc7o33u8Lm7v2jfewP0Qua0pRYSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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