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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7b32d6b41b5de4754f8295ceb935d4e5c9647dabf1a973989b554ebaeb736d' 
  AND token = 'SC2IJknO0NErgqQcV1AUMyuE0gbRo34MegbRPFtwTf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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