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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3b76275e4669f3f8d02f7b315ef688fc513e25276d3ece2309859122beb497' 
  AND token = 'lLvO8M8+sbVzUzHJJLc1/BB51o3awy6aR1NFSNNYMlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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