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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c035f21505e12e81d80b58f5f2d9aa9b96d1bf0800c742cafec26a7e50dd649b' 
  AND token = 'Z2m4P3dcw6WtTnTVteuN/I8Wvta28fjUYZjCN8LwITA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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