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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30120c7683f093e0038ade677759060915422fdf3f82a99fff98fc007830ee78' 
  AND token = 'soQnEdtfGBT4Ag57wmdnVB8/WHS6Zhfox157M7xi0qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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