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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00336156b3e92d6e7fcd10bfff8a9a95c4ba543816f437272c1eef46fbc72ea2' 
  AND token = '4e11IHGCRgWAkqDy+eD9gvcKej7U8CQy+QquKtj5bkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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