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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96748dedc82626881b3b2b343ba768d7b347d9e02dea38f9e41ccac90d9a1ae9' 
  AND token = 'JNIo2In4Ho3TCZBf674AkWVMXGeE8OMqGe6X6lb9v4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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