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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53a5484b32d3d24f26437f57217fe1816c10bd8fedc2fbf06ddb37780ff9540' 
  AND token = 'n6J8qlE18gaK6NFg9IXp4Z+0XDf/0hLzeJrnU+NaAzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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