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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23576e5054d6763ac928bccbb36d02570871f0ffdae46572f9432394e5296f2b' 
  AND token = '76WQeOr1+H7gMmVXEPyDZprtenwaO+Je//DLhNCUQ24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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