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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e55b7042cc3590cc7b45f8f5c6ae66c4897a9c0693d200601e2de331a030b6' 
  AND token = 'pdIwbq9f0lrchPF1QXhryG3WGey8gH0aoWCP56iSoAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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