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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf84a44859fb458c2732b689e5fb664c40528f7d4c54c737bd3c71462e3dfd7e' 
  AND token = 'BHwtIyq3cpRuEIJMtTgoF07R8NJg553fDXfE7HYQPKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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