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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19131d95d731cba1b178231b36fad795536e93c3d78b99a09c4b525ce564aa26' 
  AND token = 'zekhnRR7sviFLPExZZEb//2dimxr6vN76lPx4+b2LzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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