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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa4bbdd9d4419f9bfb94cdc2659ed1807099b40d4a95e83e68cd6fdcb37900e' 
  AND token = 'bVZdaMEqkEbSKsm8hDRqAOxWpV+52SsO88z9JoARY7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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