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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193622c2527e21c148ff2a6206813bd5417e4ace924f63ffb4d0672d015fafcb' 
  AND token = 'MQBTaXVbCfry+nEjM+Y4eusV3tFlneSdeN3lhdf5o+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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