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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080e15f0b69794f41208c7ffa0219140e747b04b1cff4443bc4a6d71454ea9fc' 
  AND token = 'NfL+ST60MJsO6uAQ/qQBA9alZ2O8kklxg3c8OU9r6Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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