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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe07298df02f93f75bf08621b4912832cc1b89fd1e017b91acdcf7ccc22d6ce' 
  AND token = 'noBioTvU7/CiRWHxusX16hg7ivfLCZpnpeob2LQMZTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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