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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bb34403bfe4f475aeb1e84e11781eb7083e60afef372cc34dc1e6ab6906e86' 
  AND token = 'PzRw1C14qt+XzN8czmdGuNf5PPd1INKEBIq8r3v9jXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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