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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84583fc257ef86d8eb4a20a71f5dfa17ffa150f7cd2f4eaece648c02df06290' 
  AND token = 'D80y9v3Ky8YUbOJ7CUjN/qLvJHVY1BCb/7UrNYo9Cs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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