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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156ec072ab842f53008366431a8cf3bed90e63d2603846f2bb488e976578f0b9' 
  AND token = '3+nSQpNx3Voe1wAQVKTqO/WH0Qf+crN+gKCS2f23daw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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