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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2962829d3da56941da3f85d2410f6e3598e1df52f8e17e59637d09195c79f9' 
  AND token = 'LGg6h/cbd9pZqnKL5sqlnB1EKv1nC9PngIYfrexedbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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