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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccbe328a720670e8bf6fc7148ab7be485ee84b09918faea6a609c54a17f3087' 
  AND token = '9a0Bcm50P74zqsM/RNKcOy8yPFXhiwnnzG+MCdwl1sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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