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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0355bfff0b5a609b3f08181c44e1ea034492eb46d775ea0a6d2af9430d1cb90d' 
  AND token = 'anbV6hOSOZIlZXZbj4Q4TwqvTfYoYGGThMcB1KkCQwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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