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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1d53d73a92424204fec4142ba922c7d93c6c485f4a8c6019fb4cfb96b53edd' 
  AND token = 'kz28EgXRH1MeJT3MQE8ctw7h8RvPFi3wRTCzb9LZHZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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