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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82425e57e20eddf3aa9b146638aa6d4b6d7b37f4bf74dcc85cbe8734d17199bc' 
  AND token = '2oFEkGfkfYVNfcNJbkpn3fnI9MnWaeqaOJdrjomI2dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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