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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b71d4c93a50d719573a110429726010901a0e8cc785762566f8962c2887f39c' 
  AND token = 'V7nE6/ACJeRu15eVpHHyuwCz44vHllEGR9TzVXKrgzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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