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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71efdb12f5203b44597aad9b95d24c7ed359cb65495ee167ba2d5a8bce4b52f8' 
  AND token = '/x4Ae3nG576PNeAFxvQPqCi3hp7SnPUFdlsIbOy/m40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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