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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb74db03475593269218aa35bfb8e93663b072bc9fa5b44e4a7fe7c24219892' 
  AND token = 'Yq84vQ4LIaaxCb7/1JJ/xt6yeU+nmZxPkCwCPb+T2Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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