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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0967a668d4eec5fd9280f9290a69e8ead1515309c3a6782696ee6a7d71fe5d50' 
  AND token = '9+xXDHRcNF+rsHd7l0O97XZMWNn7GxeW0Zc2V4ZdxJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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