SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ce7e5f8cb569e946963ef96ab548cb761b1f06205c6f66f3be4929a3525ada' 
  AND token = 'h4LykzuAGTD+jqji48G/SgKj8eEGVx1AoKDVB/wjlvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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