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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efd3e994e3edd46279a885e259440a813d9f4dce0693cbbbf201eba70a30337' 
  AND token = 'IFvgpfddhQy5qMFs3sqYod2FwYA371AKyu5dXta8BV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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