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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b89291d3a5800746be7981787ea23b1e9bb77799a216fdef82bc8f17f50097f' 
  AND token = '9K6iMA7PuLeEBJ54IBXr3ruxXJlncSgTFTw0iHsrEVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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