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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934ea6e60bdfcb66f7cd637992e5af947b4f4e222ddbf85137651fc252fdaeda' 
  AND token = '37jhyibSg5kMd1wzLd9+3Y6AbaxqULmJMeD4z8Cn43A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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