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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2af3a48c93edc5b7b4d340a13541188573bbd4c6c60062efc6ea88ecbc06a71' 
  AND token = 'VNZPva0Z27DWanzVOMdB4RfQlhscMl2KWQZOl6pye/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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