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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d72267889e26faf41cc28aeecc22574e46401b3b7ecd89e828c0e5fe81a75b2' 
  AND token = 'Kv38ks3h1nPNarKtOWxv4yiH31FAK/sORDn/k0L7whk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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