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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa44ccda5a701d13d7e8fe2164617f6ccf3a2c2437ea9a55cee89d0be214e2d5' 
  AND token = 'tI3HtFE7xJIiCV56JmGL2q78LaqH+GJX740k4Iy4qOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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