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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a90c72845c0431f0f29e2391240b3b0718f1b6f44e3139a24702f7ea6b66ee7' 
  AND token = '35RypZbfUB6zLqKPNvzJbunm9fZHn3KfnBKYmfzgZrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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