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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad028ac5faa0953862a9b0816d3ae8938bc5db745f97d4f744fe34df4f1a5b2b' 
  AND token = 'OZy7HcRrWRZkUIrBCz8/EmQRTeqAe+doHsdGVpOquec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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