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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033b7ac1a04a9e61211827ad4b5d1273f8a77a6e8e4189f53d9b8431f5dc3868' 
  AND token = 'mKdMl1HTuzI14eE/Lv7XYjajJ+++81jNCmgBLJ3F4n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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