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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06de24467de0d5f01d022022cd93d425e4529ea6030c5bace7d9fe0374a80a0' 
  AND token = 'xgjQjbs/JFxFkdGVhsz1FDHDA8vWMZcfLohP7rNgEGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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