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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f7223c19ca7e959ed5e218e08fac7b42780401af3cd0928f7e2edbb6f650f0' 
  AND token = '6pJ7lYSznwCq9mUs7DHpWiGbaWkV4a4urqdUOU7M2Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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