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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bacfb5ac9202b24c74b6c782b91d7ea615b45a45535329abd5b3ac7af8ffd2d' 
  AND token = 'O24JjLocoyjPWfat0MvR+k4ldir2GVXPHK4yC73fzak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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