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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361f4084b304f5011ec78cdda1d2d5e01365e6af5202d98bd29c0455d10fc833' 
  AND token = 'fpQ/yX/T8WPdTrmAqXWA68Aeoxi+XWmbwz4XWLO22Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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