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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56c47f08512abb6bf4d2175d00ae7f7e56f4c5bfe9081bfa422cf80eba5b5be' 
  AND token = 'z6GRaShZ9QjgGNocdAxZQWEMkkZ9uiq2zO5nWqGxdrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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