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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176f541ad05f64736c803509f12b48370ce97d70255863c158c2af19d3172da3' 
  AND token = 'zK2WjkmxE5cE77rUY1ln6rB2iQlzwOgvjVnmQfhKf6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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