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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152ed5a742fb5da43469eb99a0ee684804df40ab505a214eb4cd93943a0d7063' 
  AND token = 'IOn0yDvBw9IS6WaeTaw9A0lJQ+gVOfeGrP6GZOu/CD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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