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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba9da74ef62cc3f28558652e4224a50f4a9cb5a051dc8fbdcc14d7d81dac0b5' 
  AND token = 'mvz4+CtN5omZw2/JrOGvWsQh22NZyZMLyBC8s7BERys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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