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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c117f09c246c968ac09f39adf025dda61fa657d4cd24af3bc0a77800d1d8e03' 
  AND token = '+xjxhr5RE6CeEh/dPuWq6L483J2NXXwaOxhTxYJSnYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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