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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce05ee971aa94733936e3bd0663bfc71924875308a15895e9a3422560872bf5f' 
  AND token = 'l16eiIRbfUGHsTenX8D1xoV5P7FQD+50S9tChquROY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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