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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4840de4a5403b234131bc44d816c7277e1249c2954f36acfc6e529a5ce43e9' 
  AND token = '9Xhz9PQ9p6Me+98iMF7OFYgzi2Ox+AjwXJaf5Cgd1tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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