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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b53d58f70f281444cfb16125d46657f1417ae8df3b916b5e8569160183a9e9c' 
  AND token = 'crcXHgc5UFvwcRuwWHjsmc4kfKqwUXgvHitcRkDOzR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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