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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67a60db22a6e94999bb238b532a09fc2c073c076dbc69fd852caa8982f86fef' 
  AND token = '+9H1X4eRJsaa4+RyknKbb9wY+h4OZuPX4INoHu7sTOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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