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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1782eba3938d175ef7698f683fe94a5d7ea14d637aadef8a95bc5a248ab4baa' 
  AND token = 'x20AZO90eIJOiLOqXjvOc/459jDLhMVQgZXS1Q0RwEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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