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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6259e67fa62015c3b291a29a7f7f5a58c46b50852f8bc4d7db64e9a6b5e0a8' 
  AND token = 'JQrF5M09oUPdX/BUQel3j16U3EdaHROhX1C/9X6xXb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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