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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dc95218fb3727196361dad6cdd44db41e7cf5fbc57d5d1803e7fe5c66eea40' 
  AND token = 'Z3/oSS+9JTC19LRVXPTqMvYWWG7gdkId0c0O0sfYTUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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