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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a23f620f01e7af9002b6c6af37853ac6893663ae6b02688b261b8cb5badf4ce' 
  AND token = 'ul6KI3kTXdD5h0LuOeuMNQk1rosRbkLjdWbWi+W/C+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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