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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30769f422808a671556bbf81a998e3edb65175a4f4a4b680793af8e9f5328d07' 
  AND token = '7JzSEdUGVjTkKy8yfbT02SXTDY741IVySg15oqE8h4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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