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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe129112437892fcb616d8c03ecc693782b3517d743a761437be35ba68adfafa' 
  AND token = 'jW9Y+sOl5XVfNe+rmXtsOMw5W3lwNsy6D+8vn6aoxHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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